The Eibach 3.75" I.D. Coilover Spring is designed specifically for 3.0 coilover shocks used in high-performance off-road suspension systems. Built to deliver consistent spring rates, predictable handling, and long service life, these springs are commonly found on rock crawlers, rock bouncers, Ultra4 race cars, desert race trucks, prerunners, trail rigs, and custom tube chassis vehicles. Available in multiple spring lengths and spring rates, Eibach springs allow builders to properly tune ride height, suspension travel, weight transfer, and overall vehicle performance.

Engineered as part of the Eibach Racing Off-Road (ERO) spring system, these springs are manufactured from premium spring steel and designed to maintain accurate spring rates even under extreme suspension loads and repeated cycling. The lightweight design maximizes available suspension travel while minimizing block height, making them ideal for both single-rate and dual-rate coilover setups. Whether you're tuning a competition vehicle or building a reliable trail machine, Eibach coilover springs provide the consistency and durability serious off-road suspension systems demand.

Includes

(1) Eibach 3.75" I.D. Coilover Spring
Selected Spring Rate
Selected Spring Length

Sold Individually

Brand: Eibach
Inside Diameter: 3.75"
3.75″ ID Length Range: 10" - 18"
Spring Rates Available: 100 lb/in – 500 lb/in
Finish: Silver Powder Coat
Spring Type: Coilover Suspension Spring
Compatible with: 3.0" Coilover Shocks
Suitable for: Single-Rate and Dual-Rate Coilover Systems
Designed for: Off-Road and Racing Applications
Design: Race-Proven ERO (Eibach Racing Off-Road)
Material: Chrome Silicon Steel (CrS)
Manufacturing Process:

Cold Wound
Heat Treated
Shot Peened

Ends: Squared & Ground at Both Ends
Coating: Protective Silver Powder Coat
Individually Rate Tested

Universal fitment for:

Fits 3.0 Coilover Shock Applications
Compatible with most 3.0 off-road coilover shocks utilizing 3.75" I.D. springs
Commonly used on:

Rock Crawlers
Rock Bouncers
Ultra4 Cars
Desert Race Trucks
Prerunners
Trail Rigs
Tube Chassis Buggies
Custom Off-Road Vehicles

Verify spring length, spring rate, and hardware compatibility before ordering.

What shocks are these springs designed for?

These springs are designed for 3.0 coilover shocks that utilize a 3.75" inside diameter spring.

What does 3.75" I.D. mean?

The 3.75" I.D. measurement refers to the inside diameter of the spring. This must match the spring hardware and coilover shock configuration being used.

How do I choose the correct spring rate?

Spring rate selection depends on vehicle weight, suspension geometry, motion ratio, ride height goals, and intended use. Heavier vehicles generally require higher spring rates, while lighter vehicles often perform best with softer rates. You can watch our tutorial on Calculating Spring Rates for more information.

Can these be used in a dual-rate coilover setup?

Yes. Eibach 3.75" coilover springs are commonly used in both single-rate and dual-rate suspension systems and are popular in custom off-road suspension applications.

Are these springs sold individually or in pairs?

These springs are sold individually. Most vehicles require two springs per axle or four springs for a complete dual-rate coilover suspension system.

Are Eibach Off-Road Coilover Springs durable?

Yes. ERO springs are engineered to maintain rate and free length even after repeated full compression cycles. They are designed to handle:

Extreme suspension cycling
High heat environments
Heavy unsprung weight
Continuous race abuse

Are these coilover springs block-stable?

Yes. In dual-rate setups, the tender spring is often designed to fully compress (block) to transition into the main spring. ERO springs are built to:

Safely block repeatedly
Maintain consistent transition points
Resist sagging or rate loss